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The electromagnetic fields throughout all of space produced by an excited finite length slot in an infinite extent perfectly conducting metallic sheet have been calculated by the double current sheet diffraction formula. The space dependence of the fields is the same as that of a thin wire antenna, but with the electric and magnetic fields interchanged. An integration of Poynting's vector over the surface of the slot gives an input resistance of 363 ohms for a center-driven half-wavelength slot. The mutual admittance between slots necessary in slot array calculations is also determined.